With 2 small modifications to snapCam.cs.dso you can disable zooming and panning in playback and YouTube export.

First, make a backup of snapCam.cs.dso! You can find in the directory "\Steam\steamapps\common\frozen synapse\psychoff\gameScripts\"

Then either use the attached file, or (if you don't trust me (rightly so)) use a hex editor to change the following values in snapCam.cs.dso:
Address: oldvalue > newvalue (all values are in hex)
0059: 37 > 30
0619: 63 > 78

The first patch sets the zoomspeed to 0. The second patch disables the centerCameraOn function, to stop panning.